Long-term Debt - Schedule of Long-term Debt (Details) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Debt Instrument [Line Items]
Total	$ 405,616,000	$ 210,714,000
Less amount due within one year	(20,848,000)	(14,286,000)
Long-term debt, exculding current maturities	384,767,857	196,428,571
Senior Notes [Member] | Unsecured Senior Notes Due January 2021 [Member]
Debt Instrument [Line Items]
Total	125,000,000	125,000,000
Senior Notes [Member] | Unsecured Senior Notes Due March 2012 through March 2018 [Member]
Debt Instrument [Line Items]
Total	71,428,000	85,714,000
Annual installments	14,285,714
Line of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Total	137,000,000	0
Term Note [Member] | Term Not Due in Quarterly Installments Beginning in June 2013 through March 2018 [Member]
Debt Instrument [Line Items]
Total	$ 72,188,000	$ 0